题目内容
(2004?北塘区)
32×40+450÷18 |
|
(6-1.3×4)÷0.1 | ||||||||||||||||
13.7×1.4-3.7×1.4 | (
|
|
分析:(1)先算乘除,再算加法;
(2)运用加法交换律与结合律简算;
(3)先算括号内的乘法,再算括号内的减法,最后算括号外的除法;
(4)运用乘法分配律简算;
(5)先算括号内的乘法,再算括号内的加法,最后算括号外的除法;
(6)先算小括号内的,再算中括号内的,最后算括号外的减法.
(2)运用加法交换律与结合律简算;
(3)先算括号内的乘法,再算括号内的减法,最后算括号外的除法;
(4)运用乘法分配律简算;
(5)先算括号内的乘法,再算括号内的加法,最后算括号外的除法;
(6)先算小括号内的,再算中括号内的,最后算括号外的减法.
解答:解:(1)32×40+450÷18,
=1280+25,
=1305;
(2)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(3)(6-1.3×4)÷0.1,
=(6-5.2)÷0.1,
=0.8÷0.1,
=8;
(4)13.7×1.4-3.7×1.4,
=(13.7-3.7)×1.4,
=10×1.4,
=14;
(5)(
+
×
)÷
,
=(
+
)×
,
=
×
,
=
;
(6)
-[(
+
)÷
],
=
-
÷
,
=
-
×
,
=
-
,
=
.
=1280+25,
=1305;
(2)
3 |
11 |
3 |
5 |
8 |
11 |
2 |
5 |
=(
3 |
11 |
8 |
11 |
2 |
5 |
3 |
5 |
=1+1,
=2;
(3)(6-1.3×4)÷0.1,
=(6-5.2)÷0.1,
=0.8÷0.1,
=8;
(4)13.7×1.4-3.7×1.4,
=(13.7-3.7)×1.4,
=10×1.4,
=14;
(5)(
2 |
3 |
6 |
7 |
7 |
24 |
11 |
32 |
=(
2 |
3 |
1 |
4 |
32 |
11 |
=
11 |
12 |
32 |
11 |
=
8 |
3 |
(6)
5 |
6 |
1 |
5 |
1 |
3 |
8 |
9 |
=
5 |
6 |
8 |
15 |
8 |
9 |
=
5 |
6 |
8 |
15 |
9 |
8 |
=
5 |
6 |
3 |
5 |
=
7 |
30 |
点评:此题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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